RunCMake: Expect empty output by default.

Expect tests to specify stderr content if it is present.

Fix the CMP0019 test, which has only been testing the WARN status
until now.  Specify in the CommandLine and FPHSA tests that content
is at least one character.

Set policies in the Language and CheckModules tests, which have empty
test output, modulo unrelated policies on some platforms.

Tests/RunCMake/CMP0019/CMakeLists.txt

@@ -1,3 +1,3 @@
 cmake_minimum_required(VERSION 2.8.4)
 project(${RunCMake_TEST} NONE)
-include(${RunCMake_TEST}.cmake)
+include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)

Tests/RunCMake/CheckModules/CMakeLists.txt

@@ -1,3 +1,4 @@
 cmake_minimum_required(VERSION 2.8.11)
+cmake_policy(SET CMP0054 NEW)
 project(${RunCMake_TEST} NONE)
 include(${RunCMake_TEST}.cmake)

Tests/RunCMake/CommandLine/RunCMakeTest.cmake

@@ -37,7 +37,9 @@ run_cmake_command(E_env-bad-arg1 ${CMAKE_COMMAND} -E env -bad-arg1)
 run_cmake_command(E_env-set   ${CMAKE_COMMAND} -E env TEST_ENV=1 ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-set.cmake)
 run_cmake_command(E_env-unset ${CMAKE_COMMAND} -E env TEST_ENV=1 ${CMAKE_COMMAND} -E env --unset=TEST_ENV ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-unset.cmake)
 
+set(RunCMake_DEFAULT_stderr ".")
 run_cmake_command(E_sleep-no-args ${CMAKE_COMMAND} -E sleep)
+unset(RunCMake_DEFAULT_stderr)
 run_cmake_command(E_sleep-bad-arg1 ${CMAKE_COMMAND} -E sleep x)
 run_cmake_command(E_sleep-bad-arg2 ${CMAKE_COMMAND} -E sleep 1 -1)
 run_cmake_command(E_sleep-one-tenth ${CMAKE_COMMAND} -E sleep 0.1)

Tests/RunCMake/FPHSA/RunCMakeTest.cmake

@@ -14,6 +14,7 @@ run_cmake(exact_1.2.3)
 run_cmake(exact_1.2.3.4)
 
 # now test every component with an invalid version
+set(RunCMake_DEFAULT_stderr ".")
 run_cmake(exact_0)
 run_cmake(exact_2)
 run_cmake(exact_1.1)
@@ -22,6 +23,7 @@ run_cmake(exact_1.2.2)
 run_cmake(exact_1.2.4)
 run_cmake(exact_1.2.3.3)
 run_cmake(exact_1.2.3.5)
+unset(RunCMake_DEFAULT_stderr)
 
 # check if searching for a version 0 works
 list(APPEND RunCMake_TEST_OPTIONS "-DCMAKE_MODULE_PATH=${CMAKE_CURRENT_LIST_DIR}" "-DPseudo_VERSION=0")

Tests/RunCMake/Languages/CMakeLists.txt

@@ -1,3 +1,4 @@
 cmake_minimum_required(VERSION 2.8.4)
+cmake_policy(SET CMP0042 NEW)
 project(${RunCMake_TEST} NONE)
 include(${RunCMake_TEST}.cmake)

Tests/RunCMake/Languages/LINK_LANGUAGE-genex-stderr.txt

@@ -6,4 +6,4 @@ CMake Error at LINK_LANGUAGE-genex.cmake:[0-9]+ \(target_link_libraries\):
   LINKER_LANGUAGE target property can not be used while evaluating link
   libraries for a static library
 Call Stack \(most recent call first\):
-  CMakeLists.txt:3 \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/Languages/link-libraries-TARGET_FILE-genex-stderr.txt

@@ -6,4 +6,4 @@ CMake Error at link-libraries-TARGET_FILE-genex.cmake:[0-9]+ \(target_link_libra
   Expressions which require the linker language may not be used while
   evaluating link libraries
 Call Stack \(most recent call first\):
-  CMakeLists.txt:3 \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/README.rst

@@ -41,7 +41,7 @@ but do not actually build anything.  To add a test:
    ``<SubTest>-stdout.txt``
     Regex matching expected stdout content
    ``<SubTest>-stderr.txt``
-    Regex matching expected stderr content
+    Regex matching expected stderr content, if not "^$"
    ``<SubTest>-check.cmake``
     Custom result check.
 

Tests/RunCMake/RunCMake.cmake

@@ -25,6 +25,13 @@ function(run_cmake test)
       unset(expect_std${o})
     endif()
   endforeach()
+  if (NOT expect_stderr)
+    if (NOT RunCMake_DEFAULT_stderr)
+      set(RunCMake_DEFAULT_stderr "^$")
+    endif()
+    set(expect_stderr ${RunCMake_DEFAULT_stderr})
+  endif()
+
   if (NOT RunCMake_TEST_SOURCE_DIR)
     set(RunCMake_TEST_SOURCE_DIR "${top_src}")
   endif()